$U$-statistics on bipartite exchangeable networks

Tâm Le Minh

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arXiv · 2103.12597

$U$-statistics on bipartite exchangeable networks

Tâm Le Minh

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Abstract

Bipartite networks with exchangeable nodes can be represented by row-column exchangeable matrices. A quadruplet is a submatrix of size $2 \times 2$. A quadruplet $U$-statistic is the average of a function on a quadruplet over all the quadruplets of a matrix. We prove several asymptotic results for quadruplet $U$-statistics on row-column exchangeable matrices, including a weak convergence result in the general case and a central limit theorem when the matrix is also dissociated. These results are applied to statistical inference in network analysis. We suggest a method to perform parameter estimation, network comparison and motifs count for a particular family of row-column exchangeable network models: the bipartite expected degree distribution (BEDD) models. These applications are illustrated by simulations.

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Tâm Le Minh. 2021-03-23. $U$-statistics on bipartite exchangeable networks. https://arxiv.org/abs/2103.12597

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